Tsinghua University

Fego Precision Industrial Co., Ltd.

Lite-on Technology Corporation

National Science Council

Lite-on Electronics (guangzhou) Limited

National Chung Cheng University

Analog Integrations Corporation

Tsai-Fu Wu

Yu-Kai Chen

Chih-Hao Chang

Chin-Hsiung Chang

Yen-Hsiang Huang

Yung-Chun Wu

Li-Chun Lin

Li-Chiun Lin

Temir Sakavov

Ying-Yi Jhang

Wen-Yang Wang

Chang-Yu Wu

Yung-Hsiang Liu

Chin-Feng Kang

Shun-Hung Lo

Huan-Cheng Liu

Kai-Li Wang

Jeng-Gung Yang

Tin-Hao Chang

Po-Hung Li

Ling-Chia Yu

Xin-Ru Huang

Yun-Tsung Liu

Che-Yi Su

Sheng-Yu Tseng

Hong-Siang Ruei

Yong-Jing Wu

Xin-yu Yu

A carriers synchronizing method of a hybrid frequency parallel inverter is proposed. A low-frequency ripple simulating step is performed to drive a high-frequency controlling unit to simulate a low-frequency ripple. An equidistant grid sampling step is performed to drive the high-frequency controlling unit to sample a sample ripple to generate a sample group and sample the low-frequency ripple to generate a plurality of low-frequency reference groups. An actual shifting angle searching step is performed to drive the high-frequency controlling unit to compare the sample group with the low-frequency reference groups to search an actual shifting angle from the reference shifting angles. A high-frequency carrier adjusting step is performed to drive a proportional integral controller to calculate the actual shifting angle to generate a sync reference, and then a period counter adjusts a starting point of the high-frequency carrier according to the sync reference.

Carriers synchronizing method of hybrid frequency parallel inverter and system thereof

A controlling method is for a single-phase bidirectional inverter. The single-phase bidirectional inverter includes a switch and an inductor. The controlling method for the single-phase bidirectional inverter includes an extracting step, a calculating step, and an integrating step. In the extracting step, a current command is inputted to the switch and obtaining a current through the inductor. The current is piecewisely linearized to extract a magnetizing inductance and a demagnetizing inductance of the inductor. In the calculating step, a duty ratio of the switch is used to calculate a variation of the current of the magnetizing inductance and a variation of the current of the demagnetizing inductance. In the integrating step, the variation of the current of the magnetizing inductance and the variation of the current of the demagnetizing inductance are integrated to obtain another duty ratio of the switch in the next cycle.

Controlling method for single-phase bidirectional inverter and device thereof

A power converting device with a high frequency inverter module compensating a low frequency inverter module is for transmitting a direct current voltage to an alternating current load module. The low frequency inverter module is controlled by a low frequency duty ratio. The high frequency inverter module is connected to the low frequency inverter module in parallel and controlled by a high frequency duty ratio. The low frequency inverter module is controlled according to the low frequency duty ratio to generate a first current. The high frequency duty ratio is adjusted according to a low-frequency ripple current. The high frequency inverter module is controlled according to the high frequency duty ratio to generate a second current, and the second current is for compensating ripples of the first current.

Power converting device and method with high-frequency inverter module compensating low-frequency inverter module

A three phase inverting device includes a three phase inverter module and a three phase filter module. The three phase inverter module includes a plurality of switches, each two switches are connected for forming a bridge arm, an input end of each of the bridge arm are coupled for forming a DC end, the DC end is connected to a DC load. The three phase filter module is connected to the three phase inverter module, wherein the three phase filter module includes a plurality of inductances and a plurality of capacitances, the inductances are connected at one side of the capacitances, a portion of the capacitances are connected to a output end of each of the bridge arm of the three phase inverter module, a portion of the inductances are connected to an AC end.

Single phase controlling method and three phase inverting device using the same

A power converting method for high frequency inverter and low frequency inverter connecting in parallel, which is for converting a direct current power into an alternating current power, includes the following steps. A low frequency inverting module which electrically connected to the direct current power is provided. A high frequency inverting module which is electrically connected to the low frequency inverting module in parallel is provided. A high frequency switching duty ratio of the high frequency inverting module is adjusted to output a second current according to a first current produced by the low frequency inverting module. The second current is for compensating ripples of the first current.

Power converting device containing high frequency inverter and low frequency inverter connecting in parallel and the method thereof

A three-phase inverting apparatus and a control method and a paralleled power conversion system thereof are provided. The control method is suitable for controlling a three-phase inverter having a plurality of switch sets, a first inductor, a second inductor, and a third inductor. The control method includes following steps: obtaining a DC bus voltage, a plurality of phase voltages, and a plurality of phase currents; obtaining inductances of the first, the second, and the third inductors; calculating a plurality of switch duty ratios by a division-summation control means according to the DC bus voltage, the phase voltages, current variations of the phase currents, the inductances, and a switching cycle based on a sinusoidal pulse width modulation (SPWM); and generating corresponding control signals based on the switch duty ratios so as to control a switching of the switch sets.

Three-phase inverting apparatus and control method and paralleled power conversion system thereof

Current of a three-phase multilevel modular converter (MMC) is controlled. The control is a division-summation (D-&#x3a3;) method yet uses integration to replace the two steps of division and summation. Common D-&#x3a3; characteristic equations are used for all areas. Inductance changes are considered in the characteristic equations. Current source is used to control converter. Therefore, the current of the converter can be traced to sinusoidal reference current even when the inductance changes become big. The modulation method and the capacitor-voltage balancing method are submodule unified pulse width modulation (SUPWM) and sorted voltage-balancing method, respectively. The current control directly obtains a law of the current change on each conducting module of an arm. It does not need complex sector judgments and table look-ups. Thus, the amount of computation and memory for a processor can be relatively reduced.

Method of current control of three-phase modular multilevel converter with inductance changes allowed

The present disclosure provides a single-phase three-wire power control system integrating the electricity of a DC power supply device to an AC power source. The single-phase three-wire power control system comprises a single-phase three-wire inverter, a driving unit, a sampling unit and a processing unit. The single-phase three-wire inverter coupled between the DC power supply device and the AC power source converts a DC voltage of the DC power supply device to an output voltage. The driving unit is coupled to the single-phase three-wire inverter. The sampling unit samples the inductor current of an inductor of the single-phase three-wire inverter. The processing unit which is coupled to the driving unit and the sampling unit controls the single-phase three-wire inverter through the driving unit. The processing unit obtains the duty ratio according to the inductance of the inductor, the total variation of the inductor current, the DC voltage and the output voltage.

Single-phase three-wire power control system and power control method therefor

A method is provided for current compensation. The method is based on division-sigma (D-&#x3a3;) control for a DC/DC converter. Inductance changes are allowed with D-&#x3a3; digital control achieved. Loop gain can be quickly adjusted. The disadvantage of average current-mode control (ACMC) is solved, where the disadvantage is a reduction of the response speed caused by the filter within the current loop. The present invention uses midpoint current sampling to ensure taking an average inductor current value in each switching cycle. By doing so, a lack of fidelity of peak current-mode control (PCMC) is solved, where the lack of fidelity is due to the amount of error value between the peak value and the average value. Besides, the present invention uses a table of the inductance following current changes to achieve compensation of duty cycle ratio, where the table is built in a single chip.

Method of current compensation based on division-sigma control for DC/DC converter

The present invention provides a load impedance estimation and repetitive control method capable of allowing inductance variation for an inverter, wherein the method is applied for predicting corresponding next-period switching duty cycles for four switching member sets of the inverter by way of sampling three phase voltages and calculating next-period voltage compensations based on the previous line-period voltage compensations. Moreover, during the calculation and prediction, the method also involves the inductance variations of the output inductors of the inverter into the load impedance estimation matrix equation. Therefore, the three phases four wires inverter with the presented load impedance estimation and repetitive control method can provide a steady output voltage to the loads even if the originally-connected loads are replaced with other different loads. Thus, this load impedance estimation and repetitive control method can indeed improve the drawbacks of the inverter controller based on conventional DQ transformation method.

Load impedance estimation and repetitive control method capable of allowing inductance variation for inverter

A method is for controlling a three-phase current converter. First, subtract a second reference current signal representing the predicted current of the three-phase terminals in the present switching cycle from a first reference current signal representing the predicted current of the three-phase terminals in the next switching cycle to obtain a predicted variation. Then, subtract a feedback current signal representing the feedback current of the three-phase terminals in the previous switching cycle from the second reference current signal delayed by one switching cycle to obtain a current error. Multiply the current error by an error coefficient then add the predicted variation to obtain a current variation. Finally, obtain duty ratios of a plurality of switches, according to the current variation and inductance of the first to the third inductor. The three-phase current converter converts electric power between a DC terminal and the three-phase terminals, according to the duty ratio.

Method for controlling three-phase current converter

A control circuit of a driving circuit for controlling a light emitting diode (LED) light source having a plurality of areas is provided. The control circuit includes the error amplifiers receiving a feed back current signal and a external reference voltage, and generating an error signal; a buffer register receiving a serial digital signal and generating the parallel digital signals; a work register receiving the parallel digital signals and a trigger signal, and outputting the parallel digital signals when the trigger signal is at a relatively high level; and a switch module having the power switches, each of which receives the error signal and the parallel digital signal for generating a driving signal to control a driving current of a specific area of the light source, in order to control the brightness in each area of the LED light source.

Control circuit of area control driving circuit for LED light source and controlling method thereof

A motor variator and a driving method thereof are provided for controlling the operating speed of a fan, which employ an alternate current chopper to change the working cycle and the rotary speed of a stepless motor. The motor variator includes a high-frequency alternate current chopper connected to an induction coil of an induction motor, an alternate current power supply connected to the high-frequency alternate current chopper and a controller connected to the high-frequency alternate current chopper for outputting a switch signal to the high-frequency alternate current chopper, such that the high-frequency alternate current chopper is controlled by the switch signal to perform a chopper action for the alternate current power supply and output a drive voltage, so as to change the rotary speed of the induction motor.

Motor speed variator and a driving method thereof

A self-sourcing exercise bike with a linear digital control magnetic resistance braking apparatus comprises a generator, a power converter, a digital control system, a magnetic braking resistance and a LED control panel. This apparatus uses a linear control method to control the change of the magnetic resistance, and the magnetic resistance braking apparatus uses a method of changing inductance and a controlling way thereof to achieve the goal of controlling the variation of the magnetic resistance braking force. This bike makes the user or rehabilitant to linearly adjust the resistance force or torque according to the speed of the exercise bike and the presetting resistance force, and easily start up the power system in the initial stage.

Self-sourcing exercise bike with a linear digital control magnetic resistance braking apparatus

A speed adjuster is provided in a belt-disc sander for controlling the rotating speed of a motor of the belt-disc sander. A speed adjust knob is disposed outside the belt-disc sander. The speed adjuster has a control circuit, a current sensor, a drive circuit, and a converter. The current sensor detects the motor current and feeds back to the control circuit, which controls the frequency variation of a SPWM signal of the drive circuit in response to the input of the speed adjust knob. The converter transforms the square wave voltage into an AC voltage for driving the motor. The desired rotating speed can be adjusted through the speed adjust knob. The control circuit will compare the present rotating speed of the motor with the set rotating speed to determine whether the present rotating speed conforms to the set one for correcting the rotating speed of the motor.

Growing community of inventors

Chiayi County, Taiwan

Tsai-Fu Wu